though

From Middle English though, thogh, from Old Norse *þóh (later þó). Superseded (in most dialects) Middle English thegh, from Old English þēah (“though, although, even if, that, however, nevertheless, yet, still; whether”). Both the Old Norse and Old English are from Proto-Germanic *þauh (“though”), from Proto-Indo-European *to-, suffixed with Proto-Germanic *-hw < Proto-Indo-European *-kʷe (“and”).

Akin to Scots tho (“though”), Saterland Frisian dach (“though”), West Frisian dôch, dochs (“though”), Dutch doch (“though”), German doch (“though”), Danish dog (“though, however”), Swedish dock (“however, still”), Icelandic þó (“though”). More at that.